opencv 摄像头

    VideoCapture cap();
    if(!cap.isOpened())
        return -;
    Mat frame, edges;
    namedWindow("edges",);
    for(;;)
    {
        cap >> frame;
        cvtColor(frame, edges, CV_BGR2GRAY);
        GaussianBlur(edges, edges, Size(,), 1.5, 1.5);
        Canny(edges, edges, , , );
        imshow("edges", edges);
        if(waitKey() >= ) break;
    }